Improved crystallizability and processability of ultra high molecular weight polyethylene modified by poly(amido amine) dendrimers

Abstract

Ultrahigh molecular weight polyethylene (UHMWPE) is usually difficult to be melt processed due to severe intermolecular entanglement in its melt. In this work, we reported the development of a poly(amido amine) (PAMAM) dendrimer (G1) and its derivatives with different terminal groups which showed promising feasibility for aiding UHMWPE melt processing. The rheological, crystalline, and mechanical properties of the blends were investigated comprehensively. The addition of the dendritic modifiers to the UHMWPE matrix resulted in a significant decrease in melt viscosity, thus an obvious enhancement of the processability. The dynamic analysis of the mechanical properties and rotation‐rheological test indicated a disentanglement effect of the UHMWPE melt molecules was generated by the PAMAM dendrimer (G1) and its derivatives. Furthermore, the PAMAM dendrimer (G1), as an internal lubricant, was uniformly distributed in the UHMWPE matrix. The heteronucleation effect of the PAMAM dendrimer (G1) with its derivatives led to a higher degree of crystallinity, smaller crystallites in the matrix and enhanced tensile strength in the UHMWPE blends. POLYM. ENG. SCI., 57:153–160, 2017. © 2016 Society of Plastics Engineers

Preparation and thermal property of ultrahigh molecular weight polyethylene composites filled by calcium carbonate modified with long chain

“…where Δ H m is the melting enthalpy of samples measured by DSC, H m 0 is the melting enthalpy of 100% crystalline UHMWPE (291 J /g), 37,38 and w is the mass content of UHMWPE in the composites.…”

The Influence of Pressure-Induced-Flow Processing on the Morphology, Thermal and Mechanical Properties of Polypropylene Blends

“…However, due to its low impact strength and poor weather resistance, the application of PP in the engineering field is limited. The existing methods to improve the mechanical properties of PP generally include branching [3,4], material blending [5][6][7], and polymer material blend [8][9][10][11][12][13]. Polymer blend materials are widely used because of their low cost, simple operation and high feasibility.…”

UHMWPE-Based Glass-Fiber Composites Fabricated by FDM. Multiscaling Aspects of Design, Manufacturing and Performance

“…It is known that UHMWPE can be plasticized by loading with polypropylene (PP) [ 7 , 8 , 9 , 10 , 11 ], polyethylene glycol (PEG) [ 12 , 13 , 14 , 15 ], high density polyethylene (HDPE) [ 16 , 17 , 18 , 19 , 20 ], etc. Liu et al [ 7 ] studied the morphology and properties of ‘UHMWPE+PP’-based composites fabricated by the extrusion of mixtures using a single screw extruder.…”

“…The optimum conditions for mixing the feedstocks in the extruder were established. Kuang et al [ 20 ] improved the UHMWPE’s manufacturability by loading with poly(amido amine) dendrimer, and its derivatives with various end groups. Filling the UHMWPE matrix with dendritic modifiers resulted in a significant decrease in the melt viscosity, which allowed for an improvement in its processability.…”